From 506ada89629ec7059b96ecfb0dc7d33ece0103ca Mon Sep 17 00:00:00 2001 From: Eduard Zingerman Date: Fri, 4 Sep 2026 17:05:56 -0700 Subject: bpf: mark a NULL kfunc argument precise check_kfunc_arg() allows bpf_register_is_null() for nullable arguments w/o marking the underlying scalar register precise. Hence a checkpoint created on such a path would prune against arbitrary scalar value. Fixes: 3bda08b63670 ("bpf: Allow NULL buffers in bpf_dynptr_slice(_rw)") Signed-off-by: Eduard Zingerman Link: https://lore.kernel.org/r/20260904-register-is-null-precise-fixes-v1-5-0f5a360ff15d@gmail.com Signed-off-by: Alexei Starovoitov --- fs/netfs/fscache_proc.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 fs/netfs/fscache_proc.c (limited to 'fs/netfs/fscache_proc.c') diff --git a/fs/netfs/fscache_proc.c b/fs/netfs/fscache_proc.c new file mode 100644 index 000000000..874d951bc --- /dev/null +++ b/fs/netfs/fscache_proc.c @@ -0,0 +1,47 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* FS-Cache statistics viewing interface + * + * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#define FSCACHE_DEBUG_LEVEL CACHE +#include +#include +#include +#include "internal.h" + +/* + * Add files to /proc/fs/netfs/. + */ +int __init fscache_proc_init(void) +{ + if (!proc_symlink("fs/fscache", NULL, "netfs")) + goto error_sym; + + if (!proc_create_seq("fs/netfs/caches", S_IFREG | 0444, NULL, + &fscache_caches_seq_ops)) + goto error; + + if (!proc_create_seq("fs/netfs/volumes", S_IFREG | 0444, NULL, + &fscache_volumes_seq_ops)) + goto error; + + if (!proc_create_seq("fs/netfs/cookies", S_IFREG | 0444, NULL, + &fscache_cookies_seq_ops)) + goto error; + return 0; + +error: + remove_proc_entry("fs/fscache", NULL); +error_sym: + return -ENOMEM; +} + +/* + * Clean up the /proc/fs/fscache symlink. + */ +void fscache_proc_cleanup(void) +{ + remove_proc_subtree("fs/fscache", NULL); +} -- cgit v1.3.1